Mathematics, 08.11.2019 12:31 kcarstensen59070
Let x be the random variable representing the number of calls received in an hour by a 911 emergency service. a portion of the probability distribution of x is given below. value of x 0 1 2 3 4 probability p(x) 0.25 0.10 0.05 suppose the probability that x = 1 and the probability that x = 2 are the same. what are these probabilities? what is the expected number of 911 calls in an hour?
Answers: 1
, and we're given other probabilities, so we have
![E[X]=\displaystyle\sum_xx\,P(X=x)](/tpl/images/0365/5340/7f0c5.png)
![E[X]=0\,P(X=0)+1\,P(X=1)+\cdots+4\,P(X=4)](/tpl/images/0365/5340/b82a3.png)
![E[X]=1.4](/tpl/images/0365/5340/2ceff.png)
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Let x be the random variable representing the number of calls received in an hour by a 911 emergency...
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